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<h1>ATAN</h1>
<p>ATAN 函数可得出数字的反正切值。</p>
<div class="HIStrings"><p><strong class="Term">ATAN</strong>(<em>数字</em>)</p>
    <div class="HISubString"><p><em class="Term">数字： </em><a href="ffa361b4f72.html#ffa361b4f72"
                                                             class="xRef Aside">数字值</a>。 </p></div>
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<div id="ffa5ca34a8" class="Subhead"><h2 class="Name"><strong>注释</strong></h2>
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        <li><p>ATAN 函数可计算正切值并得出相应的角度，该角度用范围在 –π/2 至 +π/2（–pi/2 至 +pi/2）之间的弧度表示。若要查看以度数而非弧度表示的结果角度，可在 DEGREES 函数中绕排此函数，即
            =DEGREES(ATAN(<em>数字</em>))。</p></li>
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        <th scope="col"><p class="TableHead">示例</p></th>
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        <td><p>=ATAN(1) 将得出弧度为 0.785398163397448 的角度（45 度），其正切值为 1。</p>
            <p>=DEGREES(ATAN(1)) 得出 45。</p></td>
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<div class="LinkUniversal"><strong>另请参阅</strong><a href="ffa5cb9325.html#ffa5cb9325" class="xRef AppleTopic">ATAN2</a><a
        href="ffa5c8e90c.html#ffa5c8e90c" class="xRef AppleTopic">ATANH</a><a href="ffa5cb3ce6.html#ffa5cb3ce6"
                                                                              class="xRef AppleTopic">DEGREES</a><a
        href="ffa5c66235.html#ffa5c66235" class="xRef AppleTopic">TAN</a><a href="ffa5c5b63d.html#ffa5c5b63d"
                                                                            class="xRef AppleTopic">TANH</a></div>
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